<template>
  <div class="container">
    <el-form ref="form" :model="form" label-width="80px">
      <el-form-item label="标题">
        <el-input v-model="form.name"></el-input>
      </el-form-item>
      <el-form-item label="时间">
        <el-col :span="11">
          <el-time-picker placeholder="选择时间" v-model="form.date" style="width: 100%;"></el-time-picker>
        </el-col>
      </el-form-item>

      <!-- 遍历已创建的选项渲染 -->
      <div class="item" v-for="(item, index) in form.itemList" :key="index">
        <el-form-item :label="(index+1)+''">
          <div class="item_title">
            <span>、{{typeMap[item.type]}}: </span>
            <span v-text="item.title"></span>
          </div>
          <!-- 单项填空 -->
          <div v-if="item.type==='input'">
            <el-input class="disabled" placeholder="禁止输入" disabled></el-input>
          </div>
          <!-- 单选 -->
          <div v-else-if="item.type==='radio'">
            <div class="warp" v-for="(elm, i) in item.textList" :key="i">
              <el-radio :label="(i+1)+'、'"></el-radio>
              <el-input v-model="item.textList[i]"></el-input>
            </div>
          </div>

          <!-- 多选 -->
          <div v-else-if="item.type==='checkbox'">
            <div class="warp" v-for="(elm, i) in item.textList" :key="i">
              <el-checkbox :label="(i+1)+'、'"></el-checkbox>
              <el-input v-model="item.textList[i]"></el-input>
            </div>
          </div>

          <!-- 选择填空 -->
          <div v-else-if="item.type === 'select'">
            <el-select v-model="value" placeholder="请选择">
              <el-option
                v-for="(elm, i) in item.textList" :key="i"
                :label="item.textList[i]"
                :value="i+''">
              </el-option>
            </el-select>
          </div>

          <!-- 矩阵填空 -->
          <div v-else-if="item.type==='matrix'">
            <div class="warp" v-for="(elm, i) in item.textList" :key="i">
              <span> {{item.textList[i]}}：</span>
              <el-input class="disabled" placeholder="禁止输入" disabled></el-input>
            </div>
          </div>
          <!-- 上移、下移、删除 -->
          <div style="margin-top: 10px">
            <el-button @click="handleItem('up', item)" v-if="index!=0">上移</el-button>
            <el-button @click="handleItem('down', item)" v-if="index!=form.itemList.length-1">下移</el-button>
            <el-button @click="handleItem('del', item)">删除</el-button>
            <el-button @click="edit(item, index)">编辑</el-button>
          </div>
        </el-form-item>
      </div>

      <!-- 添加选项 -->
      <el-form-item>
        <el-button @click="add('radio')">单选</el-button>
        <el-button @click="add('checkbox')">多选</el-button>
        <el-button @click="add('input')">单项填空</el-button>
        <el-button @click="add('select')">选择填空</el-button>
        <el-button @click="add('matrix')">矩阵填空</el-button>
      </el-form-item>

      <el-form-item>
        <el-button type="primary" @click="onSubmit">立即创建</el-button>
      </el-form-item>

      <!-- 添加选项弹出框 -->
      <div class="additem">
        <el-dialog
          :title="typeMap[questItem.type]"
          :visible.sync="showItem"
          width="50%">
          <el-form-item label="标题">
            <el-input v-model="itemTitle"></el-input>
          </el-form-item>
          <el-form-item label="添加选项" v-show="questItem.type != 'input'">
            <el-input-number v-model="num" @change="handleChange" :min="1" :max="10"></el-input-number>
          </el-form-item>
          <el-form-item label="选项" v-for="(text, i) in itemText" :key="i" v-show="questItem.type != 'input'">
            <el-input v-model="itemText[i]"></el-input>
          </el-form-item>
          <span slot="footer" class="dialog-footer">
            <el-button @click="clearItem">取 消</el-button>
            <el-button type="primary" @click="determine">确 定</el-button>
          </span>
        </el-dialog>
      </div>
    </el-form>
  </div>

</template>

<script>
export default {
  name: "successdemo",
  data(){
    return{
      value: '',
      matrixsNum: 1,
      num: 1,
      form: {
        itemList: [],
        name: '',
        date: ''
      },
      itemTitle: '',
      itemText: new Array(1),
      questItem: {},
      showItem: false,
      typeMap: {
        radio: '单选',
        checkbox: '多选',
        input: '问答',
        matrix: '矩阵问答',
        select: '选择'
      },
      editIndex: ''
    }
  },
  watch: {
    showItem() {
      if(!this.showItem){
        this.clearItem()
      }
    }
  },
  methods: {
    // 创建选项
    add(type){
      this.questItem.type = type
      this.showItem = true
    },
    // 增加/减少 子选项
    handleChange(val){
      this.itemText.length = val
    },
    // 确定将选项添加进列表中进行渲染
    determine(){
      if(this.questItem.type=='input'){
        // 填空
        if(this.itemTitle == ''){
          this.$message('请输入选项的标题内容');
          return
        }
        if(this.editIndex !== '') {
          this.questItem.title = this.itemTitle
          this.form.itemList.splice(this.editIndex, 1, this.questItem)
          this.editIndex = ''
        }else{
          this.questItem.title = this.itemTitle;
          this.form.itemList.push(this.questItem);
        }
        this.clearItem()
      }else if(this.questItem.type == 'radio' || this.questItem.type == 'checkbox' || this.questItem.type == 'matrix' || this.questItem.type == 'select'){
        // 单选、多选、矩阵
        if(this.itemTitle == ''){
          this.$message('请输入选项的标题内容');
          return
        }
        for (var i = 0; i < this.itemText.length; i++){
          if(this.itemText[i] == '' || this.itemText[i] == undefined){
            this.$message('请完整输入每个选项内容');
            return
          }
        }
        if(this.editIndex !== '') {
          this.questItem.title = this.itemTitle;
          this.questItem.textList = this.itemText;
          this.form.itemList.splice(this.editIndex, 1, this.questItem)
          this.editIndex = ''
        }else{
          this.questItem.title = this.itemTitle;
          this.questItem.textList = this.itemText;
          this.form.itemList.push(this.questItem);
        }
        this.clearItem()
      }
    },
    // 编辑
    edit(item, editIndex){
      this.editIndex = editIndex
      if(item.type !== 'input'){
        this.num = item.textList.length
        this.showItem = true
        this.questItem = item
        this.itemTitle = item.title
        this.itemText = []
        this.itemText.push(...item.textList)
      }else{
        this.showItem = true
        this.questItem = item
        this.itemTitle = item.title
      }
    },
    // 关闭弹窗，清空数据
    clearItem(){
      this.num = 1
      this.itemTitle = ''
      this.itemText = ['']
      this.questItem = {}
      this.showItem = false
    },
    // 判断上移、下移、删除
    handleItem(val, item){
      switch(val){
        case 'up':
          this.moveUp(item);
          break;
        case 'down':
          this.moveDown(item);
          break;
        case 'del':
          this.delItem(item);
          break;
        default:
          throw new Error("该操作不存在！")
      }
    },
    // 上移
    moveUp(item){
      let index = this.form.itemList.indexOf(item)
      this.form.itemList.splice(index, 1)
      this.form.itemList.splice(index-1, 0, item)
    },
    // 下移
    moveDown(item){
      let index = this.form.itemList.indexOf(item)
      this.moveUp(this.form.itemList[index+1])
    },
    // 删除
    delItem(item){
      let index = this.form.itemList.indexOf(item)
      this.form.itemList.splice(index, 1)
    },
    // 提交
    onSubmit() {
      if(this.form.name == ''){
        this.$message('请输入标题内容');
        return
      }
      if(this.form.date == ''){
        this.$message('请选择时间');
        return
      }
      if(this.form.itemList.length == 0){
        this.$message('至少添加一个选项');
        return
      }
      console.log(this.form);
    }
  }
}
</script>

<style scoped>
.warp{
  display: flex;
  align-items: center;
}

input{
  -webkit-appearance: none;
  background-color: #FFF;
  background-image: none;
  border-radius: 4px;
  border: 1px solid #DCDFE6;
  box-sizing: border-box;
  color: #606266;
  font-size: inherit;
  height: 40px;
  line-height: 40px;
  outline: 0;
  padding: 0 15px;
  transition: border-color .2s cubic-bezier(.645,.045,.355,1);
  margin: 10px 0 0;
}
.el-radio {
  color: #606266;
  cursor: pointer;
  margin-right: 0;
}
</style>
